/*
 * #!
 * Ontopia Navigator
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * !#
 */

package net.ontopia.topicmaps.nav2.taglibs.tolog;

import java.util.Collection;

import net.ontopia.topicmaps.nav2.core.ContextManagerIF;
import net.ontopia.utils.CollectionUtils;

/**
 * INTERNAL: Helper class used when creating QueryProcessors. Helps
 * the query processor map query variable names to the values of a
 * particular row, and make these available to the ContextManager.
 */
public class ContextManagerScopingMapWrapper extends ContextManagerMapWrapper {

  public ContextManagerScopingMapWrapper(ContextManagerIF contextManager) {
    super(contextManager);
  }

  @Override
  public Object get(Object key) {
    Collection coll = (Collection) super.get(key);
    if (coll == null)
      return null;
    return CollectionUtils.getFirstElement(coll);
  }
}
